There is no lining. I've listed it as a size M, but there is no size label on the product. It's light and thin. I think it can be worn as a light jacket in the summer to protect against air conditioning, or in the spring and autumn. I don't know the exact purchase date or price, but I think it cost around 20,000 to 30,000 yen?! I haven't used it much, so it's in good condition. I will fold it up small for shipping.